body {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
}

.card {
    border-radius: 15px;
    border: none;
}

.card-header {
    border-radius: 15px 15px 0 0 !important;
}

.input-group {
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.form-control:focus, .form-select:focus {
    box-shadow: none;
    border-color: #86b7fe;
}

.btn-success {
    background-color: #28a745;
    border-color: #28a745;
    transition: all 0.3s ease;
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(40,167,69,0.3);
}

#result {
    background: rgba(255,255,255,0.9);
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.text-primary {
    color: #007bff !important;
}

.text-success {
    color: #28a745 !important;
}

.instructions {
    background: rgba(255,255,255,0.9);
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

@media (max-width: 768px) {
    .card {
        margin: 15px;
    }
    
    .input-group {
        flex-direction: column;
    }
    
    .form-select {
        margin-top: 10px;
    }
}
